COVID-19 on Friday amid the federal government’s approval of a third coronavirus vaccine, boosting the country’s rollout. Canada approves AstraZeneca’s COVID-19 vaccine The new numbers come amid Health Canada’s approval of the AstraZeneca vaccine Friday, marking a third approval following that of Pfizer and Moderna — all of which require two separate doses.Though the vaccine was less effective in its clinical trials than that of its rivals, the shot offered major benefits such as being able to be stored and transported at normal refrigerated temperatures.